Compute pageScaleFactor on page so that fixed layout page fits width of window.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index c34ade4703e4dc391b2587fea0eb0751fb7d2f4d..640d513c8bf9a5232f8a72ba38bb55c067701031 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -580,6 +580,7 @@ class RenderViewImpl : public RenderWidget,
   virtual gfx::Size GetSize() OVERRIDE;
   virtual gfx::NativeViewId GetHostWindow() OVERRIDE;
   virtual WebPreferences& GetWebkitPreferences() OVERRIDE;
+  virtual int GetDefaultDeviceScaleFactor() const OVERRIDE;
   virtual WebKit::WebView* GetWebView() OVERRIDE;
   virtual WebKit::WebNode GetFocusedNode() const OVERRIDE;
   virtual WebKit::WebNode GetContextMenuNode() const OVERRIDE;
@@ -1012,6 +1013,8 @@ class RenderViewImpl : public RenderWidget,
   // should be drawn.
   gfx::Size disable_scrollbars_size_limit_;
 
+  int default_device_scale_factor_;
+
   // Loading state -------------------------------------------------------------
 
   // True if the top level frame is currently being loaded.